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Tuesday, September 10, 2013

ANTS USE PARASITIC GUESTS AS MILITIAS TO PROTECT THEIR COLONIES FROM ATTACKERS

Fungus-farming ants use their house guests as a useful standing army to protect their colony against dangerous threats.
 
While ants are unusually free of infectious diseases, their societies are often invaded by social parasites; insects that exploit the resources of ant colonies for their own benefit and force the hosts to work harder.
 
Such lodgers escape detection by the social immune system of their hosts by producing bar-code like chemical recognition labels similar to the host's own, while others use brute force or obnoxious chemicals to infiltrate or usurp host colonies.
 
However, these unwelcome guests can come in useful for the host colony.
 
Fungus-farming ants use their house guests as a useful standing army to protect their colony against dangerous threats
 
University of Copenhagen researchers studied ant warfare between three parties to discover that cohabiting guest colonies of ants can serve as an effective front line defense for a colony.
 
Just like a war movie
 
They studied a colony of peaceful fungus-farming ants facing two natural enemies and reported the scenes were 'reminiscent of dramas in human history and literature'.
 
Raider ants, the genus Gnamptogenys hartmani, seeking to enter the host's home, favour a swift style of attack to kill defenders, plunder a nest and steal food to usurp the original colony in a style of warfare not similar to Genghis Khan in the Middle Ages.
 
But the attackers did not reckon on the fungus-farming ants having powerful protectors - the fierce Megalomyrmex symmetochus guest ant parasite.
 
The researchers said the Megalomyrmex ants are the second natural enemy of the farmers and use alkaloid poison to permanently move in with a farming host colony to exploit its fungus farm at relative leisure.
 
While these invader ants are a lifelong burden for the farmers, they can turn out to be a life-saving asset when mobile raiders threaten them, as the guest ants rise to the defense of their hosts.
 
The scientists found that the guest ant defenses are so effective that they not only kill raiders, but their mere presence greatly decreases the probability of a raid.
 
 
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Other ant news on this blog:
 
May 26, 2013 - Alliance between carnivorous plants and ants -
 
May 18, 2013 - Invasive crazy ants displacing fire ants in the US
 
April 15, 2013 - Ants and other insects able to predict earthquakes
 
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